What does the Bible say about being an heir of Christ?

According to Galatians 4:29, if we are Christ's, then we are considered Abraham's seed and heirs according to the promise. This signifies that we participate in the same covenantal blessings that were granted to Abraham due to our union with Christ. The promises made to Abraham are fulfilled in Christ, and for all who are in Him, we share in the inheritance and the rights as children of God. Being an heir means we have received all spiritual blessings and have access to the fullness of God's grace.